Roof Ventilation in Kenya: Vent Boards, Eave Boards andWhy They Matter
Roof Ventilation in Kenya
What Is Roof Ventilation and Why Does It Matter
Roof ventilation refers to the movement of air through the roof space — the area above your
ceiling and below the underside of your roof covering. This space is sometimes called the
attic or roof void.
A well-ventilated roof space allows:
– Cool air to enter from the eaves at the lower edge of the roof
-Hot, moist air to exit through the ridge or upper vents
Understanding the Roof Eave: Where Ventilation Begins
Before looking at specific products, it helps to understand the anatomy of a roof eave,
because this is where ventilation either happens or does not.
The eave is the lower edge of the roof that overhangs beyond the wall. Underneath it is the
soffit — the horizontal surface that closes off the gap between the top of the wall and the
underside of the roof. In many Kenyan homes, this soffit is either:
– Left completely open (allowing pests and birds to enter)
– Closed with solid timber boards (blocking all airflow)
– Finished with thin plywood or fibre sheets that deteriorate quickly
None of these approaches is ideal. What is needed is a material that closes the eave neatly,
keeps out pests, but still allows controlled airflow into the roof space. That is precisely what
vent boards and eave boards are designed to do.
Vent Boards: The Foundation of a Properly Ventilated Roof
What Are Vent Boards?
Vent boards — also called soffit vent boards or eave ventilation boards — are perforated
panels installed on the underside of the roof eaves. The perforations are precision-sized: large
enough to allow adequate airflow, but small enough to prevent insects, rodents, and birds
from entering the roof space.
Builders Duka supplies fiber cement vent boards that are specifically engineered for the
demands of Kenyan construction. Unlike timber eave boards, which warp and rot over time,
or thin plywood panels, which delaminate in rain and humidity, fiber cement vent boards are
built to last for the life of the structure.
Key Properties of Builders Duka Fiber Cement Vent Boards
– Non-asbestos construction
– Fire resistant.
-Water and moisture resistant..
-Termite and rot resistant.
-Dimensionally stable..
-Durable and low maintenance
Eave Boards: Completing the Roof Edge
What Is the Difference Between a Vent Boards and an Eave Boards?
This is a common source of confusion for homeowners and even some contractors.
– A vent board is perforated and is installed specifically to allow airflow. It is positioned
to create the inlet for the ventilation circuit.
-An eave board (sometimes called a soffit board or fascia board underlay) is a
broader term for any board used to close off the soffit area under the eaves. Some
eave boards are solid; others are perforated for ventilation.
Why Fiber Cement Is the Right Material for Eave Boards in Kenya
Traditional materials used for eave boarding in Kenya include:
– Timber planks — prone to rot, warping, and termite damage; require regular
repainting
-Thin plywood — delaminate quickly when exposed to rain; short lifespan in humid
conditions
-Asbestos cement sheets — now known to be hazardous and no longer
recommended
Fiber cement eave boards from Builders Duka address all of these weaknesses. They combine
the rigidity and durability of cement with a smooth, paintable surface that gives a finished,
modern appearance to the eave — and they do it without any of the maintenance headaches
associated with timber or plywood.
Get a Ventilation Estimate for Your Project
Whether you are designing a new home, completing a commercial development, or
renovating an existing structure, Builders Duka’s team can help you specify the right vent
board products for your roof design.
Call: 0720 81 41 41 | 0736 81 41 41
Website: www.buildersduka.co.ke
